/*

Class GuessMyNumber 

  This class plays a game with a user.  The program 
  generates a random number between 1 and 100.  The player 
  then has 10 turns to guess the number.  The program prompts
  the player for their guess.  The player's guess is 
  validated.  If the guess is not valid a message is 
  displayed and the turn is over.  If the guess is valid
  then a message is displayed stating whether the correct
  number is higher, lower, or exactly correct.  If the 
  player guesses the number within 10 turns they win and the 
  game ends.

Inputs:  There are no command line inputs to this program.
         The user is prompted to enter integers.

Outputs: Messages are displayed to the screen.

History: 06/17/02 Jeff LeBeau.

******************************************************/

public class GuessMyNumber
{
   static int number;
   
   public static void main(String[] args)
   {
      // Generate the number
      number = generateNumber();

      if (playTurn(1)) return;
      if (playTurn(2)) return;
      if (playTurn(3)) return;
      if (playTurn(4)) return;
      if (playTurn(5)) return;
      if (playTurn(6)) return;
      if (playTurn(7)) return;
      if (playTurn(8)) return;
      if (playTurn(9)) return;
      if (!playTurn(10)) 
      {
         System.out.println("Sorry! You lose.");
      }
   }

   /*******************************************************
    The printRules method does not receive any input. It 
    just prints some lines to the screen
   *******************************************************/
   public static void printRules()
   {
      System.out.println("Welcome to Guess My Number");
      System.out.println("I have picked a number between 1 and 100 inclusive.");
      System.out.println("You must try to guess my number in 10 turns or less.\n\n"); 
   }

   /*******************************************************
    The generateNumber() method will not need any inputs.
    It will generate a random int between 1 and 100
    inclusive and return that int.
   *******************************************************/
   public static int generateNumber()
   {
      return (int)(Math.random() * 100) + 1;
   }

   /*******************************************************
    The playTurn() method receives a number that says which 
    turn we are playing.  We will need this method to return
    true or false telling the caller whether the player won 
    the game.
  
    This method prompts the player for their guess.  It reads
    the input and validates it.  If the input is not valid a
    message is displayed and the method returns false.  If 
    the input is valid then this method determines if the 
    player's guess is correct, too high, or too low.  A message
    is displayed accordingly.  If the guess was the correct 
    number the method returns true, otherwise false.
   *******************************************************/
   public static boolean playTurn(int turn)
   {
      // Prompt player for their guess and capture it.
      int guess = getGuess(turn);
   
      // validate the guess
      boolean isValid = validateInput(guess);
    
      // Handle the case where the input is invalid.
      if (!isValid)
      {
         System.out.println("Please guess a number between 1 and 100 inclusive");
         return false;
      }
  
      // If we made it here then the input was valid so compare it to 
      // the correct number
      if (guess == number)
      {  
         System.out.println("Congratulations! You win!");
         return true;
      }
      else
      {
         // Print proper message and return false
         if (number < guess)
         {
            System.out.println("The correct number is lower");
         }   
         else
         {
            System.out.println("The correct number is higher"); 
         }
         return false;
       }
   }

   /*******************************************************
    The getGuess() method receives 1 parameter as input.
    That is the current turn number.
  
    It prompts the player for a number between 1 and 100
    and returns the response from the user as an int.
   *******************************************************/
   public static int getGuess(int turn)
   {
     // We will need a TextInput object to read in the number
     TextInput tin = new TextInput();
  
     System.out.print("Turn " + turn + ": Enter an integer between 1 and 100 inclusive. ");
     return tin.readInt();
   }

   /*******************************************************
    The validateInput method receives the guess that the 
    player entered and returns true if the number lies 
    between 1 and 100 inclusive, false otherwise.
   *******************************************************/
   public static boolean validateInput(int myGuess)
   {
      if ((myGuess < 1) || (myGuess > 100))
      {
         return false;
      }
      else
      {
         return true;
      }
   }
}